12499016401 has 3 divisors (see below), whose sum is σ = 12499128201. Its totient is φ = 12498904602.

The previous prime is 12499016389. The next prime is 12499016429. The reversal of 12499016401 is 10461099421.

The square root of 12499016401 is 111799.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 10461099421 = 2141 ⋅4886081.

It is not a de Polignac number, because 12499016401 - 2¹⁹ = 12498492113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12499016441) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 55900 + ... + 167698.

It is an arithmetic number, because the mean of its divisors is an integer number (4166376067).

Almost surely, 2^12499016401 is an apocalyptic number.

12499016401 is the 111799-th square number.

12499016401 is the 55900-th centered octagonal number.

It is an amenable number.

12499016401 is a deficient number, since it is larger than the sum of its proper divisors (111800).

12499016401 is an frugal number, since it uses more digits than its factorization.

12499016401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223598 (or 111799 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The spelling of 12499016401 in words is "twelve billion, four hundred ninety-nine million, sixteen thousand, four hundred one".